/* global userSettings */
/* exported getUserSetting, setUserSetting, deleteUserSetting */
// utility functions

var ycmfCookies = {
// The following functions are from Cookie.js class in TinyMCE 3, Moxiecode, used under LGPL.

    each: function (obj, cb, scope) {
        var n, l;

        if (!obj) {
            return 0;
        }

        scope = scope || obj;

        if (typeof( obj.length ) !== 'undefined') {
            for (n = 0, l = obj.length; n < l; n++) {
                if (cb.call(scope, obj[n], n, obj) === false) {
                    return 0;
                }
            }
        } else {
            for (n in obj) {
                if (obj.hasOwnProperty(n)) {
                    if (cb.call(scope, obj[n], n, obj) === false) {
                        return 0;
                    }
                }
            }
        }
        return 1;
    },

    /**
     * Get a multi-values cookie.
     * Returns a JS object with the name: 'value' pairs.
     */
    getHash: function (name) {
        var cookie = this.get(name), values;

        if (cookie) {
            this.each(cookie.split('&'), function (pair) {
                pair = pair.split('=');
                values = values || {};
                values[pair[0]] = pair[1];
            });
        }

        return values;
    },

    /**
     * Set a multi-values cookie.
     *
     * 'values_obj' is the JS object that is stored. It is encoded as URI in wpCookies.set().
     */
    setHash: function (name, values_obj, expires, path, domain, secure) {
        var str = '';

        this.each(values_obj, function (val, key) {
            str += ( !str ? '' : '&' ) + key + '=' + val;
        });

        this.set(name, str, expires, path, domain, secure);
    },

    /**
     * Get a cookie.
     */
    get: function (name) {
        var e, b,
            cookie = document.cookie,
            p = name + '=';

        if (!cookie) {
            return;
        }

        b = cookie.indexOf('; ' + p);

        if (b === -1) {
            b = cookie.indexOf(p);

            if (b !== 0) {
                return null;
            }
        } else {
            b += 2;
        }

        e = cookie.indexOf(';', b);

        if (e === -1) {
            e = cookie.length;
        }

        return decodeURIComponent(cookie.substring(b + p.length, e));
    },

    /**
     * Set a cookie.
     *
     * The 'expires' arg can be either a JS Date() object set to the expiration date (back-compat)
     * or the number of seconds until expiration
     */
    set: function (name, value, expires, path, domain, secure) {
        var d = new Date();

        if (typeof( expires ) === 'object' && expires.toGMTString) {
            expires = expires.toGMTString();
        } else if (parseInt(expires, 10)) {
            d.setTime(d.getTime() + ( parseInt(expires, 10) * 1000 )); // time must be in miliseconds
            expires = d.toGMTString();
        } else {
            expires = '';
        }

        document.cookie = name + '=' + encodeURIComponent(value) +
            ( expires ? '; expires=' + expires : '' ) +
            ( path ? '; path=' + path : '' ) +
            ( domain ? '; domain=' + domain : '' ) +
            ( secure ? '; secure' : '' );
    },

    /**
     * Remove a cookie.
     *
     * This is done by setting it to an empty value and setting the expiration time in the past.
     */
    remove: function (name, path, domain, secure) {
        this.set(name, '', -1000, path, domain, secure);
    }
};

// Returns the value as string. Second arg or empty string is returned when value is not set.
function getUserSetting(name, def) {
    var settings = getAllUserSettings();

    if (settings.hasOwnProperty(name)) {
        return settings[name];
    }

    if (typeof def !== 'undefined') {
        return def;
    }

    return '';
}

// Both name and value must be only ASCII letters, numbers or underscore
// and the shorter, the better (cookies can store maximum 4KB). Not suitable to store text.
// The value is converted and stored as string.
function setUserSetting(name, value, _del) {
    if ('object' !== typeof userSettings) {
        return false;
    }

    var uid = userSettings.uid,
        settings = ycmfCookies.getHash('ycmf-settings-' + uid),
        path = userSettings.url,
        secure = !!userSettings.secure;

    name = name.toString().replace(/[^A-Za-z0-9_]/, '');

    if (typeof value === 'number') {
        value = parseInt(value, 10);
    } else {
        value = value.toString().replace(/[^A-Za-z0-9_]/, '');
    }

    settings = settings || {};

    if (_del) {
        delete settings[name];
    } else {
        settings[name] = value;
    }

    ycmfCookies.setHash('ycmf-settings-' + uid, settings, 31536000, path, '', secure);
    ycmfCookies.set('ycmf-settings-time-' + uid, userSettings.time, 31536000, path, '', secure);

    return name;
}

function deleteUserSetting(name) {
    return setUserSetting(name, '', 1);
}

// Returns all settings as js object.
function getAllUserSettings() {
    if ('object' !== typeof userSettings) {
        return {};
    }

    return ycmfCookies.getHash('ycmf-settings-' + userSettings.uid) || {};
}